Just like all of the other Trick Track pieces I have purchased for my girls, this one looks like fun, and the premise is great...but somewhere between development and marketing some dollars were were with-held on the quality part.
It will not work as intended, in sequence with the other pieces, you have to manually "trip" the pieces to do what they should. I tried replacing the rubber bands and still got the same results.
I have had the same result with several of the pieces. But, since my daughters LOVE them I keep trying. The idea is so great, and they can be so much fun if they would just work like they should!